package com.imooc.o2o.web.shopadmin;

import com.alibaba.dubbo.config.annotation.Reference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.imooc.o2o.dto.ImageHolder;
import com.imooc.o2o.dto.ProductExecution;
import com.imooc.o2o.entity.Product;
import com.imooc.o2o.entity.ProductCategory;
import com.imooc.o2o.entity.Shop;
import com.imooc.o2o.enums.ProductStateEnum;
import com.imooc.o2o.exceptions.ProductOperationException;
import com.imooc.o2o.service.ProductCategoryService;
import com.imooc.o2o.service.ProductService;
import com.imooc.o2o.util.CodeUtil;
import com.imooc.o2o.util.HttpServletRequestUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author yangshucheng
 * @create 2021-05-10 9:03
 */
@Controller
@RequestMapping("/shopadmin")
public class ProductManagementController {
    @Reference
    private ProductService productService;
    @Reference
    private ProductCategoryService productCategoryService;

    //支持上传商品详情图的最大数据
    private static final int IMAGEMAXCOUNT = 6;

    /**
     * 通过店铺id获取该店铺下的商品列表
     * @param request
     * @return
     */
    @RequestMapping(value = "/getproductlistbyshop",method = RequestMethod.GET)
    @ResponseBody
    private Map<String,Object> getProductListByShop(HttpServletRequest request){
        Map<String, Object> modelMap = new HashMap<>();
        //获取前台传进来的页码
        int pageIndex = HttpServletRequestUtil.getInt(request,"pageIndex");
        //获取前台传过来的每页
        int pageSize = HttpServletRequestUtil.getInt(request,"pageSize");
        //从当前session中获取店铺信息，主要是获取shopId
        Shop currentShop = (Shop) request.getSession().getAttribute("currentShop");
        //空值判断
        if ((pageIndex > -1) && (pageSize > -1) && (currentShop != null) && (currentShop.getShopId() != null)) {
            long productCategoryId = HttpServletRequestUtil.getLong(request,"productCategoryId");
            String productName = HttpServletRequestUtil.getString(request,"productName");
            Product productCondition = compactProductCondition(currentShop.getShopId(), productCategoryId,productName);
            //传入查询条件以及分页信息进行查询，返回相应商品列表以及总数
            ProductExecution pe = productService.getProductList(productCondition,pageIndex,pageSize);
            modelMap.put("productList",pe.getProductList());
            modelMap.put("count",pe.getCount());
            modelMap.put("success",true);
        }else{
            modelMap.put("success",false);
            modelMap.put("errMsg","empty pageSize or pageIndex or shopId");
        }
        return modelMap;
    }


    /**
     * 通过商品id获取商品信息
     * @param productId
     * @return
     */
    @RequestMapping(value = "/getproductbyid",method = RequestMethod.GET)
    @ResponseBody
    private Map<String, Object> getProductById(@RequestParam Long productId){
        Map<String, Object> modelMap = new HashMap<>();
        //非空判断
        if(productId > -1){
            //获取商品信息
            Product product = productService.getProductById(productId);
            //获取该店铺下的商品类别列表
            List<ProductCategory> productCategoryList = productCategoryService.getProductCategoryList(product.getShop().getShopId());
            modelMap.put("product",product);
            modelMap.put("productCategoryList",productCategoryList);
            modelMap.put("success",true);
        }else {
            modelMap.put("success",false);
            modelMap.put("errMsg","empty productId");
        }
        return modelMap;
    }

    @RequestMapping(value = "/addproduct",method = RequestMethod.POST)
    @ResponseBody
    private Map<String, Object> addProduct(HttpServletRequest request){
        Map<String, Object> modelMap = new HashMap<>();
        //验证码校验
        if (!CodeUtil.checkVerifyCode(request)){
            modelMap.put("success",false);
            modelMap.put("errMsg","输入错误的验证码");
            return modelMap;
        }
        //接受前端参数的变量的初始化，包括商品，缩略图，详情图列表实体类
        ObjectMapper mapper = new ObjectMapper();
        Product product = null;
        ImageHolder thumbnail = null;
        List<ImageHolder> productImgList = new ArrayList<>();
        CommonsMultipartResolver multipartFile = new CommonsMultipartResolver(request.getSession().getServletContext());
        try{
            //若请求中存在文件流，则取出相关的文件（包括缩略图和详情图）
            if(multipartFile.isMultipart(request)){
                thumbnail = handleImage(request,thumbnail,productImgList);
            }else {
                modelMap.put("success",false);
                modelMap.put("errMsg","上传图片不能为空");
            }
        }catch (Exception e){
            modelMap.put("success", false);
            modelMap.put("errMsg", e.toString());
            return modelMap;
        }
        try{
            String productStr = HttpServletRequestUtil.getString(request,"productStr");
            //尝试获取前端传过来的表单string流并将其转换成Product实体类
            product = mapper.readValue(productStr,Product.class);
        } catch (Exception e) {
            modelMap.put("success", false);
            modelMap.put("errMsg", e.toString());
            return modelMap;
        }
        //若product信息，缩略图以及详情图列表为非空，则开始进行商品添加操作
        if(product != null && thumbnail != null && productImgList.size() > 0){
            try{
                //从session中获取当前店铺的Id并赋值给product，减少对前端数据的依赖
                Shop currentShop = (Shop) request.getSession().getAttribute("currentShop");
                product.setShop(currentShop);
                //执行添加操作
                ProductExecution pe = productService.addProduct(product,thumbnail,productImgList);
                if(pe.getState() == ProductStateEnum.SUCCESS.getState()){
                    modelMap.put("success", true);
                } else {
                    modelMap.put("success", false);
                    modelMap.put("errMsg", pe.getStateInfo());
                }
            } catch (ProductOperationException e) {
                modelMap.put("success", false);
                modelMap.put("errMsg", e.toString());
                return modelMap;
            }
        } else {
            modelMap.put("success", false);
            modelMap.put("errMsg", "请输入商品信息");
        }
        return modelMap;
    }


    @RequestMapping(value = "/modifyproduct",method = RequestMethod.POST)
    @ResponseBody
    private Map<String, Object> modifyProduct(HttpServletRequest request){
        Map<String, Object> modelMap = new HashMap<>();
        // 区分状态，分别调用：若是商品编辑时调用则进行验证码判断，若是上下架操作则跳过验证码判断
        boolean statusChange = HttpServletRequestUtil.getBoolean(request,"statusChange");
        // 验证码判断
        if(!statusChange && CodeUtil.checkVerifyCode(request)){
            modelMap.put("success",true);
            modelMap.put("errMsg","输入了错误的验证码");
        }
        //接受前参数的变量的初始化，包括商品，缩略图，详情图列表实体类
        ObjectMapper mapper = new ObjectMapper();
        List<ImageHolder> productImgList = new ArrayList<>();
        Product product = new Product();
        ImageHolder thumbnail = null;
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                request.getSession().getServletContext()
        );
        try{
            if (multipartResolver.isMultipart(request)){
                thumbnail = handleImage(request,thumbnail,productImgList);
            }
        }catch (Exception e) {
            modelMap.put("success", false);
            modelMap.put("errMsg", e.toString());
            return modelMap;
        }
        try{
            String productStr = HttpServletRequestUtil.getString(request,"productStr");
            //尝试获取前端传过来的表单string流并将其转换成Product实体类
            product = mapper.readValue(productStr,Product.class);
        }catch (Exception e) {
            modelMap.put("success", false);
            modelMap.put("errMsg", e.toString());
            return modelMap;
        }
        //非空判断
        if (product != null){
            try{
                //从session中获取当前店铺的Id并赋值给product，减少对前端数据的依赖
                Shop currentShop = (Shop) request.getSession().getAttribute("currentShop");
                product.setShop(currentShop);
                //开始进行商品信息变更操作
                ProductExecution pe = productService.modifyProduct(product,thumbnail,productImgList);
                if (pe.getState() == ProductStateEnum.SUCCESS.getState()){
                    modelMap.put("success",true);
                }else {
                    modelMap.put("success", false);
                    modelMap.put("errMsg", pe.getStateInfo());
                }
            } catch (RuntimeException e) {
                modelMap.put("success", false);
                modelMap.put("errMsg", e.toString());
                return modelMap;
            }

        } else {
            modelMap.put("success", false);
            modelMap.put("errMsg", "请输入商品信息");
        }
        return modelMap;
    }


    /**
     * 从request里上传六张图片到thumbnail，productImgList存放缩略图
     * @param request
     * @param thumbnail
     * @param productImgList
     * @return
     * @throws IOException
     */
    private ImageHolder handleImage(HttpServletRequest request, ImageHolder thumbnail, List<ImageHolder> productImgList) throws IOException{
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
        //取出缩略图并构建ImageHolder对象
        CommonsMultipartFile thumbnailFile = (CommonsMultipartFile) multipartRequest.getFile("thumbnail");
        if (thumbnailFile != null){
            thumbnail = new ImageHolder(thumbnailFile.getOriginalFilename(),thumbnailFile.getInputStream());
        }
        //取出详情图列表并构建List<ImageHolder>列表对象，最多支持六张图片上传
        for (int i = 0;i < IMAGEMAXCOUNT;i++){
            CommonsMultipartFile productImgFile = (CommonsMultipartFile) multipartRequest.getFile("productImg" + i);
            if (productImgFile != null){
                //若取出的第i个详情图片文件流不为空，则将其加入详情图列表
                ImageHolder productImg = new ImageHolder(productImgFile.getOriginalFilename(),productImgFile.getInputStream());
                productImgList.add(productImg);
            }else{
                //若取出的第i个详情图片文件流为空吗，则终止循环
                break;
            }
        }
        return thumbnail;
    }

    /**
     * 封装商品查询条件到Product示例中
     * @param shopId
     * @param productCategoryId
     * @param productName
     * @return
     */
    private Product compactProductCondition(long shopId,long productCategoryId,String productName){
        Product productCondition = new Product();
        Shop shop = new Shop();
        shop.setShopId(shopId);
        productCondition.setShop(shop);
        //若有指定类别的要求则添加进去
        if(productCategoryId != -1L){
            ProductCategory productCategory = new ProductCategory();
            productCategory.setProductCategoryId(productCategoryId);
            productCondition.setProductCategory(productCategory);
        }
        //若有商品名模糊查询的要求则添加进去
        if (productName != null){
            productCondition.setProductName(productName);
        }
        return productCondition;
    }
}



















